The violent reaction between sodium and water is an example of :

Reduction
Oxidation
Redox reaction
Neutralization reaction

Solution

In reaction of KMnO₄ and Mohr’s salt, FeSO₄ is oxidised to

Fe²⁺
Fe³⁺
Fe
All of these

Solution

Which of the following statements are correct concerning redox properties?
(i)Ametal M for which E° for the half life reaction Mn⁺ + ne^– ⟶ M is very negative will be a good reducing agent.
(ii)The oxidizing power of the halogens decreases from chlorine to iodine.
(iii)The reducing power of hydrogen halides increases from hydrogen chloride to hydrogen iodide

(i), (ii) and (iii)
(i) and (ii)
(i) only
(ii) and(iii)

Solution

Stronger is oxidising agent, more is :

standard reduction potential of that species
the tendency to get it self oxidised
the tendency to lose electrons by that species
standard oxidation potential of that species

Solution

More is E_RP^°, more is the tendency to get itself reduced or more is oxidising power.

A compound contains atoms X,Y,Z; the oxidation number of X is +2, Y is +5 and Z is –2, therefore a possible formula of the compound is :

XY₁Z₂
X₂(YZ₃)₂
X₃(YZ₄)₂
X₃(Y₄Z₂)

Solution

On substituting the oxidation numbers of X, Y and Z in the formula,the sum is zero.(a) (+ 2 × 3) + (+5 × 2) + (– 2 × 8)= 6 + 10 –16 = 0, Hence,X₃(YZ₄)₂ is the correct formula of the compound.

In the reaction HAsO₂ + Sn²⁺ ⟶ As + Sn⁴⁺ + H₂ oxidising agent is

Sn²⁺
Sn⁴⁺
As
HAsO₂

Solution

When NaCl is dissolved in water the sodium ion becomes

oxidised
reduced
hydrolysed
hydrated

Solution

NaCl + H₂O ⟶ NaOH + HCl
Sodium ion hydrated in water.

Which of the following reactions depict the oxidising behaviour of H₂SO₄ :

2PCl₅ + H₂SO₄ ⟶ 2POCl₃ + 2HCl + SO₂Cl₂
2NaOH + H₂SO₄ ⟶ Na₂SO₄
NaCl + H₂SO₄ ⟶ NaHSO₄ + HCl
2HI + H₂SO₄ ⟶ I₂ + SO₂ + H₂O

Solution

Which of the following substances acts as an oxidising as well as a reducing agent?

Na₂O
SnCl₂
Na₂O₂
NaNO₂

Solution

In Na₂O, SnCl₂ and Na₂O₂ central atom is either in lowest or highest oxidation state, so it can function either as an oxidising or a reducing agent but not both.However, the oxidation state of N in NaNO₂ is +3 which lies between its highest(+5) and lowest (–3) values.

Which of the following behaves as both oxidising and reducing agents ?

H₂SO₄
SO₂
H₂O
HNO₃

Solution

In SO₂ the O.N. of S can increase and decrease. Hence can behave as reducing and oxidising agent. Oxidation state of S varies from –2 to 6.

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